Nonchrome Coatings Updates

1
Nonchrome Coatings Updates

• Lt Grant Parker, AFRL/MLSSO
• AF Corrosion Managers Conference
• 14-16 March 2006

2
Overview

• Background
• Non-Chrome Pretreatments
• PreKote
• BoeGel
• Alodine 5200
• Non-Chrome Primers
• MIL-PRF-85582
• MIL-PRF-23377
• Complete Non-Chrome Coating Systems
• Alodine 5200/Sicopoxy/Deft APC
• (PreKote or BoeGel)/Mg Rich Primer/Deft APC

3
Background

• GOAL Develop a Non-Chrome Coating System that
  Performs Equal to or Better than the Current
  Chrome Coating Systems.
• Current Requirements
• Pretreatments
• MIL-DTL-81706 336 hours Salt Spray (Unscribed)
• Primers
• MIL-PRF-23377 2000 hours Salt Spray (Scribed)
• 1000 hours Filiform (Scribed)
• Current Performance
• Complete Chrome Coating System

4
Background
4032 hours Salt Spray Complete Chrome System
MIL-DTL-81706 MIL-PRF-23377, Class
C2 MIL-PRF-85285
MIL-DTL-81706 MIL-PRF-23377, Class C2 Deft APC
5
Background

• No Complete Non-Chrome Coating System Qualified
• Two Paths being Pursued

Today
Future
Top Coat
Nonchrome Primer
Nonchrome Pretreatment
Substrate
Green Is Good
6
Nonchrome Pretreatments

• NCr Pretreatments with most USAF Test Data
• PreKote, BoeGel (AC-131), Alodine 5200
• PreKote and BoeGel Removal Issues w/ Chemical
  Strippers
• None Listed on QPL for MIL-DTL-81706

Typical Aluminum Surface Preparation
Alkaline Clean MIL-C-87937
Deoxidize Surface MIL-C-38334
Chrome Conversion Coating MIL-DTL-81706
Alodine 5200
BoeGel
PreKote
7
Nonchrome Pretreatments

• PreKote Replaces Cleaning, De-Ox, Conversion
  Coating steps
• Contains no corrosion inhibitors
• Promotes Superior Adhesion of Primer to Substrate
• Authorized in T.O. 1-1-8 with Chrome Primer
• Used by AETC on Trainer Aircraft
• Used by F-16 Community
• Field tested on C-130, B-52, A-10, B-1B, E-3 and
  KC-135

8
Nonchrome Pretreatments
3000 hours Salt Spray
MIL-DTL-81706 MIL-PRF-23377, Class C2 Deft APC
Complete Chrome System
PreKote MIL-PRF-23377, Class C2 Deft APC
Non- Chrome Pretreatment
2024 T-3 Aluminum
2024 T-3 Aluminum
9
Nonchrome Pretreatments

• BoeGel (AC-131) Replaces Conversion Coating
  Step
• Contains no Corrosion Inhibitors
• Promotes Superior Adhesion of Primer to Substrate
• Work Being Done to Replace the De-Ox Step
• Non-Rinse Product No Waste Water
• Identified as an Advanced Technology Development
  (ATD) Effort
• Field Tested on F-15 and KC-135
• CTIO Received Funding to Qualify to Advanced
  Performance Coating System Specification
• BoeGel/Chrome Primer/Topcoat

10
Nonchrome Pretreatments
3000 hours Salt Spray
MIL-DTL-81706 MIL-PRF-23377, Class C2 Deft APC
Complete Chrome System
BoeGel MIL-PRF-23377, Class C2 Deft APC
Non- Chrome Pretreatment
2024 T-3 Aluminum
2024 T-3 Aluminum
11
Nonchrome Pretreatments

• Alodine 5200 Replaces Conversion Coating Step
• Contains Corrosion Inhibitors
• 80 metallic (Ti, Zr, Si) and 20 Polymeric
• Best Lab Performance with Non-Chrome Primers
• Used on titanium parts of B-2 Aircraft
• Used on Boeing 747 and 777
• Used on U2 Aircraft

12
Nonchrome Pretreatments
3000 hours Salt Spray
MIL-DTL-81706 MIL-PRF-23377, Class C2 Deft APC
Complete Chrome System
Alodine 5200 MIL-PRF-23377, Class C2 Deft APC
Non- Chrome Pretreatment
2024 T-3 Aluminum
2024 T-3 Aluminum
13
Nonchrome Primers

• Qualified Products
• MIL-PRF-85582 Class N Primers
• Type I, EWDY048
• Type II, EEAE118
• MIL-PRF-23377 Class N Primers
• 16798-TEP, Hentzen
• 02-GN-083 (02-GN-084 in test), Deft
• 02-GN-084 Approved for F-15 Use

High Solids Epoxy Chemistry 340g/L VOC
PRC DeSoto
Qualified using a Chrome Conversion Coating
14
Nonchrome Primers
3000 hours Salt Spray
MIL-DTL-81706 MIL-PRF-23377, Class C2 Deft APC
Complete Chrome System
MIL-DTL-81706 Deft 02-GN-084 Deft APC
Non- Chrome Primer
2024 T-3 Aluminum
2024 T-3 Aluminum
15
Complete Nonchrome System

• To Date No qualified complete nonchrome system
• Cant combine Prekote and Defts 02-GN-084
• Evaluating a system that showed promise
• Alodine 5200 Pretreatment
• Deancos SICOPOXY 577-630 Primer
• Defts 03-GY-321 Topcoat
• Upcoming lab testing

16
Complete Nonchrome System
3000 hours Salt Spray
MIL-DTL-81706 Deft 02-GN-084 Deft APC
Non- Chrome Primer
PreKote Deft 02-GN-084 Deft APC
Complete Non- Chrome System
2024 T-3 Aluminum
2024 T-3 Aluminum
17
Complete Nonchrome System
3000 hours Salt Spray
Blisters in Field
MIL-DTL-81706 Deft 02-GN-084 Deft APC
Non- Chrome Primer
BoeGel Deft 02-GN-084 Deft APC
Complete Non- Chrome System
2024 T-3 Aluminum
2024 T-3 Aluminum
18
Complete Nonchrome System
3000 hours Salt Spray
MIL-DTL-81706 Deft 02-GN-084 Deft APC
Non- Chrome Primer
Alodine 5200 Deft 02-GN-084 Deft APC
Complete Non- Chrome System
2024 T-3 Aluminum
2024 T-3 Aluminum
19
Complete Nonchrome System

• To Date No qualified complete nonchrome system
• Cant combine Prekote and Defts 02-GN-084
• Evaluating a system that showed promise
• Alodine 5200 Pretreatment
• Deancos SICOPOXY 577-630 Primer
• Defts 03-GY-321 Topcoat
• Upcoming lab testing

20
Complete Nonchrome System
2000 hours Salt Spray
MIL-DTL-81706 MIL-PRF-23377, Class
C2 MIL-PRF-85285
Complete Chrome System
Alodine 5200 Sicopoxy 577-630 MIL-PRF-85285
Complete Non- Chrome System
2024 T-3 Aluminum
2024 T-3 Aluminum
21
Complete Nonchrome System
2000 hours Salt Spray
MIL-DTL-81706 MIL-PRF-23377, Class C2 Deft APC
Complete Chrome System
Alodine 5200 Sicopoxy 577-630 Deft APC
Complete Non- Chrome System
2024 T-3 Aluminum
2024 T-3 Aluminum
22
Complete Nonchrome System

• To Date No qualified complete nonchrome system
• Cant combine Prekote and Defts 02-GN-084
• Evaluating a system that showed promise
• Alodine 5200 Pretreatment
• Deancos SICOPOXY 577-630 Primer
• Defts 03-GY-321 Topcoat
• Upcoming lab testing
• Extend Laboratory Corrosion Testing
• Solicit Possible Test Aircraft
• Target Training Aircraft

23
Non-Chrome SystemMg-Rich Primer Development

• Concept Developed by NDSU
• Technology Licensed and Product Developed by Akzo
  Nobel
• Applied by HVLP
• VOC Compliant
• Mg-rich primer functions similar to Zn-rich
  primers
• Performs Better than Chrome in Filiform
• Mg will Not Catch Fire Stabilized in an Oxide
  Layer

No conversion coating (direct to metal)
Standard APC Topcoat
Mg-rich Primer (1 mil thick)
Aluminum Alloy
PreKote and BoeGel will Work
24
Non-Chrome SystemMg-Rich Primer Development
1000 hours Filiform
MIL-DTL-81706 MIL-PRF-23377, Class C2 Aerodur 5000
Complete Chrome System
Scotch-Brite Cleaner Mg-Rich Primer Aerodur 5000
Complete Non- Chrome System
2024 T-3 Aluminum
2024 T-3 Aluminum
25
Non-Chrome SystemMg-Rich Primer Development
2000 hours Salt Spray
MIL-DTL-81706 MIL-PRF-23377, Class C2 Aerodur 5000
Complete Chrome System
Scotch-Brite Cleaner Mg-Rich Primer Aerodur 5000
Complete Non- Chrome System
2024 T-3 Aluminum
2024 T-3 Aluminum
26
Wrap-Up

• Background
• Non-Chrome Pretreatments
• PreKote
• BoeGel
• Alodine 5200
• Non-Chrome Primers
• MIL-PRF-85582
• MIL-PRF-23377
• Complete Non-Chrome Coating Systems
• Alodine 5200/Sicopoxy/Deft APC
• (PreKote or BoeGel)/Mg Rich Primer/Deft APC

27
Questions

• Lt Grant Parker
• 937-656-9566
• Grant.Parker_at_wpafb.af.mil